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Although attractive, this series doesn't improve on extant series.
These books for second through fourth graders include basic facts about planets in our solar system, accompanied by excellent images from the latest planetary explorations. Additional considerations of "secrets"--the unknowns and puzzles that guide current scientific inquiry--illustrate the constantly changing understanding of astronomers, both historical and present-day. Critical thinking questions are appended. Reading list. Glos., ind. Review covers the following Smithsonian: Planets titles: The Secrets of Neptune, The Secrets of Earth, and The Secrets of Saturn.